/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2010 Neil C Smith.
 * 
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3 only, as
 * published by the Free Software Foundation.
 * 
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 3 for more details.
 * 
 * You should have received a copy of the GNU General Public License version 3
 * along with this work; if not, see http://www.gnu.org/licenses/
 * 
 * 
 * Please visit http://neilcsmith.net if you need additional information or
 * have any questions.
 */

package net.neilcsmith.praxis.impl;

import net.neilcsmith.praxis.core.ExecutionContext;

/**
 *
 * @author Neil C Smith
 */
public abstract class AbstractClockComponent extends AbstractComponent
        implements ExecutionContext.ClockListener, ExecutionContext.StateListener {

    private ExecutionContext context;
    
    @Override
    public void hierarchyChanged() {
        super.hierarchyChanged();
        ExecutionContext ctxt = getLookup().get(ExecutionContext.class);
        if (context != ctxt) {
            if (context != null) {
                context.removeStateListener(this);
                context.removeClockListener(this);
            }
            if (ctxt != null) {
                ctxt.addStateListener(this);
                ctxt.addClockListener(this);
                stateChanged(ctxt);
            }
            context = ctxt;
        }
    }

    public void stateChanged(ExecutionContext source) {
        // no op
    }
    
    



}
